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Why cast in zinc


Apart from longer die life, zinc diecastings have other avantages over alloys of higher melting point. The most important is the greater accuracy and complexity obtainable with Zinc alloy.


The speed of production may also be higher, as the cold chamber machines required for Aluminium castings are slower in operation, even when using auto-ladles and auto extractions.


Zinc alloys are far easier to finish by decorative plating, hence they are used in areas where a high level of cosmetic appearance is required.


Duc to the thin sections that may be cast, and the accuracy of the casting tolerances archievable, it is common to find zinc casting used as a fully finished component, where there is no subsequent machining or finishing undertaken.


Zinc alloys exhibit good resistance to corrosion, and may be expected to resemble the behaviour of unalloyed zinc. Unprotected castings may tarnish out of doors and acquire a compact and firmly adhering layer of corrosion product. Rates of corrosion will rarely exceed 12 microns per annum in the most severe industrial atmospheres, but may be only 10 percent of this figure in rural arcas. In confined damp areas, where galvanised material may exhibit a white fine powder on the surface, zinc castings may require a chromate passivating treatment. This treatment is recommended for tropical or marine environments.